World No.1 Roger Federer will continue his quest for a third Australian Open title when he takes on Spain's Tommy Robredo in a quarter-final on Tuesday night.

Federer, who won here last year and in 2004, is yet to drop a set in this year's tournament.

His head-to-head record against Robredo suggests the Spanish seventh seed will have to produce something extraordinary to have any chance of winning.

The Swiss master has won all six of their previous matches and has not dropped a set against Robredo in their last four meetings.

The winner of Tuesday's match will play the winner of Tuesday's clash between Americans Andy Roddick and Mardy Fish.

Roddick, the sixth seed, is ranked 35 places higher than Fish and has won their past four meetings.

He also holds an enormous experience advantage, having made it to this stage of a grand slam tournament on 11 previous occasions, while it is a first for Fish.

Tuesday's two women's quarter-finals also each include a player who has reached that stage for the first time.

Israel's Shahar Peer is one of them, with the 16th seed to take on American Serena Williams, a winner of seven grand slam singles titles, including two Australian Opens.

Williams is unseeded in this event after injuries caused her to plummet in the rankings last year.

In the other women's match, unseeded 19-year-old Lucie Safarova will play fellow Czech Nicole Vaidisova, the 10th seed.

Safarova had only won one grand slam match before this tournament, against Australia's Samantha Stosur in last year's US Open.

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